Slack promises that a paid “Enterprise” edition of the service is coming in 2016, with a new set of features to help bridge the gap. And Slack has a ton of positive buzz and lots of paying customers — we use Slack at Business Insider, even.

But it’s great proof that good word-of-mouth and lots of Silicon Valley buzz doesn’t mean that it’s easy to overcome the established players in the market. And it’s probably a big jolt of confidence to Atlassian, which has largely been overshadowed by Slack’s hype for the last few years.

Slack and Uber did not respond to a request for comment at the time of publication.

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